Claiming that the faults of big business are not the faults of capitalism is logically and morally equivalent to saying that the faults of big governments are not the faults of communism.
Last I heard, the modern corporation was defined by its system of distributing residual claims and the nature of those claims. Just as socialism is a definite system of governance and socialists should not be blurring it to simply mean anything that desires the greater benefit of the society, capitalism is also a very definite system of ownership and cannot be over-extended to mean just all the good things with the idealised free market. Corporatism is a stupid word.
So, stop with that argument already. It is tautological.